DAYTON V-Belt: 5L260, 26 in Outside Lg, 21/32 in Top Wd, 3/8 in Thick Product Description 5L section V-belts are light duty belts for fractional horsepower (FHP) applications. They have a nominal top width of 21/32" and a nominal thickness of 3/8" (actual dimensions may vary slightly). FHP V-belts, identified with an "L," are single belts used on drive systems that are typically operating at 3 HP or less. These V-belts are often used in HVAC equipment and appliances. D9